﻿// Copyright (c) 2010 Dan Popick

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Open.Web.Stijl.Utility
{
    public class CachedResourceInfo: IEquatable<CachedResourceInfo>
    {
        public string ETag { get; set; }
        public string LastModified { get; set; }

		public bool IsNull { get { return ETag == null && LastModified == null; } }

		public bool Equals(CachedResourceInfo other)
        {
            return (ETag == null
                || other.ETag == null
                || ETag == other.ETag)
                && (LastModified == null
                || other.LastModified == null
                || LastModified == other.LastModified);
        }

        static public CachedResourceInfo FromRequest(System.Web.HttpRequest request)
        {
            return new CachedResourceInfo()
            {
                LastModified = request.Headers["If-Modified-Since"],
                ETag = request.Headers["If-None-Match"]
            };
        }
    }
}
